Commit | Line | Data |
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b886d83c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
b5e95b48 JJ |
2 | /* |
3 | * AppArmor security module | |
4 | * | |
5 | * This file contains AppArmor LSM hooks. | |
6 | * | |
7 | * Copyright (C) 1998-2008 Novell/SUSE | |
8 | * Copyright 2009-2010 Canonical Ltd. | |
b5e95b48 JJ |
9 | */ |
10 | ||
3c4ed7bd | 11 | #include <linux/lsm_hooks.h> |
b5e95b48 JJ |
12 | #include <linux/moduleparam.h> |
13 | #include <linux/mm.h> | |
14 | #include <linux/mman.h> | |
15 | #include <linux/mount.h> | |
16 | #include <linux/namei.h> | |
17 | #include <linux/ptrace.h> | |
18 | #include <linux/ctype.h> | |
19 | #include <linux/sysctl.h> | |
20 | #include <linux/audit.h> | |
3486740a | 21 | #include <linux/user_namespace.h> |
ab9f2115 MG |
22 | #include <linux/netfilter_ipv4.h> |
23 | #include <linux/netfilter_ipv6.h> | |
63c16c3a | 24 | #include <linux/zlib.h> |
b5e95b48 | 25 | #include <net/sock.h> |
e262e32d | 26 | #include <uapi/linux/mount.h> |
b5e95b48 JJ |
27 | |
28 | #include "include/apparmor.h" | |
29 | #include "include/apparmorfs.h" | |
30 | #include "include/audit.h" | |
31 | #include "include/capability.h" | |
d8889d49 | 32 | #include "include/cred.h" |
b5e95b48 JJ |
33 | #include "include/file.h" |
34 | #include "include/ipc.h" | |
56974a6f | 35 | #include "include/net.h" |
b5e95b48 | 36 | #include "include/path.h" |
637f688d | 37 | #include "include/label.h" |
b5e95b48 | 38 | #include "include/policy.h" |
cff281f6 | 39 | #include "include/policy_ns.h" |
b5e95b48 | 40 | #include "include/procattr.h" |
2ea3ffb7 | 41 | #include "include/mount.h" |
c0929212 | 42 | #include "include/secid.h" |
b5e95b48 JJ |
43 | |
44 | /* Flag indicating whether initialization completed */ | |
545de8fe | 45 | int apparmor_initialized; |
b5e95b48 | 46 | |
df323337 SAS |
47 | union aa_buffer { |
48 | struct list_head list; | |
49 | char buffer[1]; | |
50 | }; | |
d4669f0b | 51 | |
341c1fda JJ |
52 | #define RESERVE_COUNT 2 |
53 | static int reserve_count = RESERVE_COUNT; | |
54 | static int buffer_count; | |
d4669f0b | 55 | |
df323337 SAS |
56 | static LIST_HEAD(aa_global_buffers); |
57 | static DEFINE_SPINLOCK(aa_buffers_lock); | |
d4669f0b | 58 | |
b5e95b48 JJ |
59 | /* |
60 | * LSM hook functions | |
61 | */ | |
62 | ||
63 | /* | |
d9087c49 | 64 | * put the associated labels |
b5e95b48 JJ |
65 | */ |
66 | static void apparmor_cred_free(struct cred *cred) | |
67 | { | |
d9087c49 | 68 | aa_put_label(cred_label(cred)); |
69b5a44a | 69 | set_cred_label(cred, NULL); |
b5e95b48 JJ |
70 | } |
71 | ||
72 | /* | |
73 | * allocate the apparmor part of blank credentials | |
74 | */ | |
75 | static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
76 | { | |
69b5a44a | 77 | set_cred_label(cred, NULL); |
b5e95b48 JJ |
78 | return 0; |
79 | } | |
80 | ||
81 | /* | |
d9087c49 | 82 | * prepare new cred label for modification by prepare_cred block |
b5e95b48 JJ |
83 | */ |
84 | static int apparmor_cred_prepare(struct cred *new, const struct cred *old, | |
85 | gfp_t gfp) | |
86 | { | |
69b5a44a | 87 | set_cred_label(new, aa_get_newest_label(cred_label(old))); |
b5e95b48 JJ |
88 | return 0; |
89 | } | |
90 | ||
91 | /* | |
92 | * transfer the apparmor data to a blank set of creds | |
93 | */ | |
94 | static void apparmor_cred_transfer(struct cred *new, const struct cred *old) | |
95 | { | |
69b5a44a | 96 | set_cred_label(new, aa_get_newest_label(cred_label(old))); |
b5e95b48 JJ |
97 | } |
98 | ||
3b529a76 JJ |
99 | static void apparmor_task_free(struct task_struct *task) |
100 | { | |
101 | ||
102 | aa_free_task_ctx(task_ctx(task)); | |
3b529a76 JJ |
103 | } |
104 | ||
105 | static int apparmor_task_alloc(struct task_struct *task, | |
106 | unsigned long clone_flags) | |
107 | { | |
f4ad8f2c | 108 | struct aa_task_ctx *new = task_ctx(task); |
3b529a76 | 109 | |
de62de59 | 110 | aa_dup_task_ctx(new, task_ctx(current)); |
b5e95b48 | 111 | |
3b529a76 | 112 | return 0; |
b5e95b48 JJ |
113 | } |
114 | ||
115 | static int apparmor_ptrace_access_check(struct task_struct *child, | |
116 | unsigned int mode) | |
117 | { | |
b2d09ae4 JJ |
118 | struct aa_label *tracer, *tracee; |
119 | int error; | |
120 | ||
1f8266ff | 121 | tracer = __begin_current_label_crit_section(); |
b2d09ae4 JJ |
122 | tracee = aa_get_task_label(child); |
123 | error = aa_may_ptrace(tracer, tracee, | |
338d0be4 JJ |
124 | (mode & PTRACE_MODE_READ) ? AA_PTRACE_READ |
125 | : AA_PTRACE_TRACE); | |
b2d09ae4 | 126 | aa_put_label(tracee); |
1f8266ff | 127 | __end_current_label_crit_section(tracer); |
b2d09ae4 JJ |
128 | |
129 | return error; | |
b5e95b48 JJ |
130 | } |
131 | ||
132 | static int apparmor_ptrace_traceme(struct task_struct *parent) | |
133 | { | |
b2d09ae4 JJ |
134 | struct aa_label *tracer, *tracee; |
135 | int error; | |
136 | ||
ca3fde52 | 137 | tracee = __begin_current_label_crit_section(); |
b2d09ae4 JJ |
138 | tracer = aa_get_task_label(parent); |
139 | error = aa_may_ptrace(tracer, tracee, AA_PTRACE_TRACE); | |
140 | aa_put_label(tracer); | |
ca3fde52 | 141 | __end_current_label_crit_section(tracee); |
b2d09ae4 JJ |
142 | |
143 | return error; | |
b5e95b48 JJ |
144 | } |
145 | ||
146 | /* Derived from security/commoncap.c:cap_capget */ | |
147 | static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective, | |
148 | kernel_cap_t *inheritable, kernel_cap_t *permitted) | |
149 | { | |
637f688d | 150 | struct aa_label *label; |
b5e95b48 JJ |
151 | const struct cred *cred; |
152 | ||
153 | rcu_read_lock(); | |
154 | cred = __task_cred(target); | |
637f688d | 155 | label = aa_get_newest_cred_label(cred); |
c70c86c4 | 156 | |
b1d9e6b0 CS |
157 | /* |
158 | * cap_capget is stacked ahead of this and will | |
159 | * initialize effective and permitted. | |
160 | */ | |
c70c86c4 JJ |
161 | if (!unconfined(label)) { |
162 | struct aa_profile *profile; | |
163 | struct label_it i; | |
164 | ||
165 | label_for_each_confined(i, label, profile) { | |
166 | if (COMPLAIN_MODE(profile)) | |
167 | continue; | |
168 | *effective = cap_intersect(*effective, | |
169 | profile->caps.allow); | |
170 | *permitted = cap_intersect(*permitted, | |
171 | profile->caps.allow); | |
172 | } | |
b5e95b48 JJ |
173 | } |
174 | rcu_read_unlock(); | |
637f688d | 175 | aa_put_label(label); |
b5e95b48 JJ |
176 | |
177 | return 0; | |
178 | } | |
179 | ||
6a9de491 | 180 | static int apparmor_capable(const struct cred *cred, struct user_namespace *ns, |
c1a85a00 | 181 | int cap, unsigned int opts) |
b5e95b48 | 182 | { |
637f688d | 183 | struct aa_label *label; |
b1d9e6b0 CS |
184 | int error = 0; |
185 | ||
637f688d JJ |
186 | label = aa_get_newest_cred_label(cred); |
187 | if (!unconfined(label)) | |
c1a85a00 | 188 | error = aa_capable(label, cap, opts); |
637f688d | 189 | aa_put_label(label); |
cf797c0e | 190 | |
b5e95b48 JJ |
191 | return error; |
192 | } | |
193 | ||
194 | /** | |
195 | * common_perm - basic common permission check wrapper fn for paths | |
196 | * @op: operation being checked | |
197 | * @path: path to check permission of (NOT NULL) | |
198 | * @mask: requested permissions mask | |
199 | * @cond: conditional info for the permission request (NOT NULL) | |
200 | * | |
201 | * Returns: %0 else error code if error or permission denied | |
202 | */ | |
47f6e5cc | 203 | static int common_perm(const char *op, const struct path *path, u32 mask, |
b5e95b48 JJ |
204 | struct path_cond *cond) |
205 | { | |
637f688d | 206 | struct aa_label *label; |
b5e95b48 JJ |
207 | int error = 0; |
208 | ||
637f688d JJ |
209 | label = __begin_current_label_crit_section(); |
210 | if (!unconfined(label)) | |
aebd873e | 211 | error = aa_path_perm(op, label, path, 0, mask, cond); |
637f688d | 212 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
213 | |
214 | return error; | |
215 | } | |
216 | ||
217 | /** | |
31f75bfe | 218 | * common_perm_cond - common permission wrapper around inode cond |
b5e95b48 | 219 | * @op: operation being checked |
31f75bfe | 220 | * @path: location to check (NOT NULL) |
b5e95b48 | 221 | * @mask: requested permissions mask |
b5e95b48 JJ |
222 | * |
223 | * Returns: %0 else error code if error or permission denied | |
224 | */ | |
31f75bfe | 225 | static int common_perm_cond(const char *op, const struct path *path, u32 mask) |
b5e95b48 | 226 | { |
31f75bfe JJ |
227 | struct path_cond cond = { d_backing_inode(path->dentry)->i_uid, |
228 | d_backing_inode(path->dentry)->i_mode | |
229 | }; | |
b5e95b48 | 230 | |
31f75bfe JJ |
231 | if (!path_mediated_fs(path->dentry)) |
232 | return 0; | |
233 | ||
234 | return common_perm(op, path, mask, &cond); | |
b5e95b48 JJ |
235 | } |
236 | ||
237 | /** | |
31f75bfe | 238 | * common_perm_dir_dentry - common permission wrapper when path is dir, dentry |
b5e95b48 | 239 | * @op: operation being checked |
31f75bfe JJ |
240 | * @dir: directory of the dentry (NOT NULL) |
241 | * @dentry: dentry to check (NOT NULL) | |
b5e95b48 | 242 | * @mask: requested permissions mask |
31f75bfe | 243 | * @cond: conditional info for the permission request (NOT NULL) |
b5e95b48 JJ |
244 | * |
245 | * Returns: %0 else error code if error or permission denied | |
246 | */ | |
31f75bfe JJ |
247 | static int common_perm_dir_dentry(const char *op, const struct path *dir, |
248 | struct dentry *dentry, u32 mask, | |
249 | struct path_cond *cond) | |
b5e95b48 | 250 | { |
31f75bfe | 251 | struct path path = { .mnt = dir->mnt, .dentry = dentry }; |
b5e95b48 | 252 | |
31f75bfe | 253 | return common_perm(op, &path, mask, cond); |
b5e95b48 JJ |
254 | } |
255 | ||
256 | /** | |
257 | * common_perm_rm - common permission wrapper for operations doing rm | |
258 | * @op: operation being checked | |
259 | * @dir: directory that the dentry is in (NOT NULL) | |
260 | * @dentry: dentry being rm'd (NOT NULL) | |
261 | * @mask: requested permission mask | |
262 | * | |
263 | * Returns: %0 else error code if error or permission denied | |
264 | */ | |
47f6e5cc | 265 | static int common_perm_rm(const char *op, const struct path *dir, |
b5e95b48 JJ |
266 | struct dentry *dentry, u32 mask) |
267 | { | |
c6f493d6 | 268 | struct inode *inode = d_backing_inode(dentry); |
b5e95b48 JJ |
269 | struct path_cond cond = { }; |
270 | ||
efeee83a | 271 | if (!inode || !path_mediated_fs(dentry)) |
b5e95b48 JJ |
272 | return 0; |
273 | ||
274 | cond.uid = inode->i_uid; | |
275 | cond.mode = inode->i_mode; | |
276 | ||
277 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
278 | } | |
279 | ||
280 | /** | |
281 | * common_perm_create - common permission wrapper for operations doing create | |
282 | * @op: operation being checked | |
283 | * @dir: directory that dentry will be created in (NOT NULL) | |
284 | * @dentry: dentry to create (NOT NULL) | |
285 | * @mask: request permission mask | |
286 | * @mode: created file mode | |
287 | * | |
288 | * Returns: %0 else error code if error or permission denied | |
289 | */ | |
47f6e5cc | 290 | static int common_perm_create(const char *op, const struct path *dir, |
d6b49f7a | 291 | struct dentry *dentry, u32 mask, umode_t mode) |
b5e95b48 JJ |
292 | { |
293 | struct path_cond cond = { current_fsuid(), mode }; | |
294 | ||
efeee83a | 295 | if (!path_mediated_fs(dir->dentry)) |
b5e95b48 JJ |
296 | return 0; |
297 | ||
298 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
299 | } | |
300 | ||
989f74e0 | 301 | static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
302 | { |
303 | return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE); | |
304 | } | |
305 | ||
d3607752 | 306 | static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry, |
4572befe | 307 | umode_t mode) |
b5e95b48 JJ |
308 | { |
309 | return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE, | |
310 | S_IFDIR); | |
311 | } | |
312 | ||
989f74e0 | 313 | static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
314 | { |
315 | return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE); | |
316 | } | |
317 | ||
d3607752 | 318 | static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry, |
04fc66e7 | 319 | umode_t mode, unsigned int dev) |
b5e95b48 JJ |
320 | { |
321 | return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode); | |
322 | } | |
323 | ||
81f4c506 | 324 | static int apparmor_path_truncate(const struct path *path) |
b5e95b48 | 325 | { |
e53cfe6c | 326 | return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR); |
b5e95b48 JJ |
327 | } |
328 | ||
d3607752 | 329 | static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry, |
b5e95b48 JJ |
330 | const char *old_name) |
331 | { | |
332 | return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE, | |
333 | S_IFLNK); | |
334 | } | |
335 | ||
3ccee46a | 336 | static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir, |
b5e95b48 JJ |
337 | struct dentry *new_dentry) |
338 | { | |
637f688d | 339 | struct aa_label *label; |
b5e95b48 JJ |
340 | int error = 0; |
341 | ||
efeee83a | 342 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 JJ |
343 | return 0; |
344 | ||
637f688d JJ |
345 | label = begin_current_label_crit_section(); |
346 | if (!unconfined(label)) | |
8014370f | 347 | error = aa_path_link(label, old_dentry, new_dir, new_dentry); |
637f688d | 348 | end_current_label_crit_section(label); |
cf797c0e | 349 | |
b5e95b48 JJ |
350 | return error; |
351 | } | |
352 | ||
3ccee46a AV |
353 | static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry, |
354 | const struct path *new_dir, struct dentry *new_dentry) | |
b5e95b48 | 355 | { |
637f688d | 356 | struct aa_label *label; |
b5e95b48 JJ |
357 | int error = 0; |
358 | ||
efeee83a | 359 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 JJ |
360 | return 0; |
361 | ||
637f688d JJ |
362 | label = begin_current_label_crit_section(); |
363 | if (!unconfined(label)) { | |
8486adf0 KC |
364 | struct path old_path = { .mnt = old_dir->mnt, |
365 | .dentry = old_dentry }; | |
366 | struct path new_path = { .mnt = new_dir->mnt, | |
367 | .dentry = new_dentry }; | |
c6f493d6 DH |
368 | struct path_cond cond = { d_backing_inode(old_dentry)->i_uid, |
369 | d_backing_inode(old_dentry)->i_mode | |
b5e95b48 JJ |
370 | }; |
371 | ||
aebd873e | 372 | error = aa_path_perm(OP_RENAME_SRC, label, &old_path, 0, |
e53cfe6c JJ |
373 | MAY_READ | AA_MAY_GETATTR | MAY_WRITE | |
374 | AA_MAY_SETATTR | AA_MAY_DELETE, | |
b5e95b48 JJ |
375 | &cond); |
376 | if (!error) | |
aebd873e | 377 | error = aa_path_perm(OP_RENAME_DEST, label, &new_path, |
e53cfe6c | 378 | 0, MAY_WRITE | AA_MAY_SETATTR | |
b5e95b48 JJ |
379 | AA_MAY_CREATE, &cond); |
380 | ||
381 | } | |
637f688d | 382 | end_current_label_crit_section(label); |
cf797c0e | 383 | |
b5e95b48 JJ |
384 | return error; |
385 | } | |
386 | ||
be01f9f2 | 387 | static int apparmor_path_chmod(const struct path *path, umode_t mode) |
b5e95b48 | 388 | { |
31f75bfe | 389 | return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD); |
b5e95b48 JJ |
390 | } |
391 | ||
7fd25dac | 392 | static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid) |
b5e95b48 | 393 | { |
31f75bfe | 394 | return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN); |
b5e95b48 JJ |
395 | } |
396 | ||
3f7036a0 | 397 | static int apparmor_inode_getattr(const struct path *path) |
b5e95b48 | 398 | { |
e53cfe6c | 399 | return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR); |
b5e95b48 JJ |
400 | } |
401 | ||
94817692 | 402 | static int apparmor_file_open(struct file *file) |
b5e95b48 | 403 | { |
637f688d JJ |
404 | struct aa_file_ctx *fctx = file_ctx(file); |
405 | struct aa_label *label; | |
b5e95b48 JJ |
406 | int error = 0; |
407 | ||
efeee83a | 408 | if (!path_mediated_fs(file->f_path.dentry)) |
b5e95b48 JJ |
409 | return 0; |
410 | ||
411 | /* If in exec, permission is handled by bprm hooks. | |
412 | * Cache permissions granted by the previous exec check, with | |
413 | * implicit read and executable mmap which are required to | |
414 | * actually execute the image. | |
415 | */ | |
416 | if (current->in_execve) { | |
55a26ebf | 417 | fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP; |
b5e95b48 JJ |
418 | return 0; |
419 | } | |
420 | ||
94817692 | 421 | label = aa_get_newest_cred_label(file->f_cred); |
637f688d | 422 | if (!unconfined(label)) { |
496ad9aa | 423 | struct inode *inode = file_inode(file); |
b5e95b48 JJ |
424 | struct path_cond cond = { inode->i_uid, inode->i_mode }; |
425 | ||
aebd873e | 426 | error = aa_path_perm(OP_OPEN, label, &file->f_path, 0, |
b5e95b48 JJ |
427 | aa_map_file_to_perms(file), &cond); |
428 | /* todo cache full allowed permissions set and state */ | |
55a26ebf | 429 | fctx->allow = aa_map_file_to_perms(file); |
b5e95b48 | 430 | } |
637f688d | 431 | aa_put_label(label); |
b5e95b48 JJ |
432 | |
433 | return error; | |
434 | } | |
435 | ||
436 | static int apparmor_file_alloc_security(struct file *file) | |
437 | { | |
33bf60ca | 438 | struct aa_file_ctx *ctx = file_ctx(file); |
637f688d | 439 | struct aa_label *label = begin_current_label_crit_section(); |
b5e95b48 | 440 | |
33bf60ca CS |
441 | spin_lock_init(&ctx->lock); |
442 | rcu_assign_pointer(ctx->label, aa_get_label(label)); | |
443 | end_current_label_crit_section(label); | |
444 | return 0; | |
b5e95b48 JJ |
445 | } |
446 | ||
447 | static void apparmor_file_free_security(struct file *file) | |
448 | { | |
33bf60ca CS |
449 | struct aa_file_ctx *ctx = file_ctx(file); |
450 | ||
451 | if (ctx) | |
452 | aa_put_label(rcu_access_pointer(ctx->label)); | |
b5e95b48 JJ |
453 | } |
454 | ||
341c1fda JJ |
455 | static int common_file_perm(const char *op, struct file *file, u32 mask, |
456 | bool in_atomic) | |
b5e95b48 | 457 | { |
190a9518 | 458 | struct aa_label *label; |
b5e95b48 JJ |
459 | int error = 0; |
460 | ||
192ca6b5 JJ |
461 | /* don't reaudit files closed during inheritance */ |
462 | if (file->f_path.dentry == aa_null.dentry) | |
463 | return -EACCES; | |
464 | ||
637f688d | 465 | label = __begin_current_label_crit_section(); |
341c1fda | 466 | error = aa_file_perm(op, label, file, mask, in_atomic); |
637f688d | 467 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
468 | |
469 | return error; | |
470 | } | |
471 | ||
064dc947 JJ |
472 | static int apparmor_file_receive(struct file *file) |
473 | { | |
341c1fda JJ |
474 | return common_file_perm(OP_FRECEIVE, file, aa_map_file_to_perms(file), |
475 | false); | |
064dc947 JJ |
476 | } |
477 | ||
b5e95b48 JJ |
478 | static int apparmor_file_permission(struct file *file, int mask) |
479 | { | |
341c1fda | 480 | return common_file_perm(OP_FPERM, file, mask, false); |
b5e95b48 JJ |
481 | } |
482 | ||
483 | static int apparmor_file_lock(struct file *file, unsigned int cmd) | |
484 | { | |
485 | u32 mask = AA_MAY_LOCK; | |
486 | ||
487 | if (cmd == F_WRLCK) | |
488 | mask |= MAY_WRITE; | |
489 | ||
341c1fda | 490 | return common_file_perm(OP_FLOCK, file, mask, false); |
b5e95b48 JJ |
491 | } |
492 | ||
47f6e5cc | 493 | static int common_mmap(const char *op, struct file *file, unsigned long prot, |
341c1fda | 494 | unsigned long flags, bool in_atomic) |
b5e95b48 | 495 | { |
b5e95b48 JJ |
496 | int mask = 0; |
497 | ||
637f688d | 498 | if (!file || !file_ctx(file)) |
b5e95b48 JJ |
499 | return 0; |
500 | ||
501 | if (prot & PROT_READ) | |
502 | mask |= MAY_READ; | |
503 | /* | |
504 | * Private mappings don't require write perms since they don't | |
505 | * write back to the files | |
506 | */ | |
507 | if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE)) | |
508 | mask |= MAY_WRITE; | |
509 | if (prot & PROT_EXEC) | |
510 | mask |= AA_EXEC_MMAP; | |
511 | ||
341c1fda | 512 | return common_file_perm(op, file, mask, in_atomic); |
b5e95b48 JJ |
513 | } |
514 | ||
e5467859 AV |
515 | static int apparmor_mmap_file(struct file *file, unsigned long reqprot, |
516 | unsigned long prot, unsigned long flags) | |
b5e95b48 | 517 | { |
341c1fda | 518 | return common_mmap(OP_FMMAP, file, prot, flags, GFP_ATOMIC); |
b5e95b48 JJ |
519 | } |
520 | ||
521 | static int apparmor_file_mprotect(struct vm_area_struct *vma, | |
522 | unsigned long reqprot, unsigned long prot) | |
523 | { | |
524 | return common_mmap(OP_FMPROT, vma->vm_file, prot, | |
341c1fda JJ |
525 | !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0, |
526 | false); | |
b5e95b48 JJ |
527 | } |
528 | ||
2ea3ffb7 JJ |
529 | static int apparmor_sb_mount(const char *dev_name, const struct path *path, |
530 | const char *type, unsigned long flags, void *data) | |
531 | { | |
532 | struct aa_label *label; | |
533 | int error = 0; | |
534 | ||
535 | /* Discard magic */ | |
536 | if ((flags & MS_MGC_MSK) == MS_MGC_VAL) | |
537 | flags &= ~MS_MGC_MSK; | |
538 | ||
539 | flags &= ~AA_MS_IGNORE_MASK; | |
540 | ||
541 | label = __begin_current_label_crit_section(); | |
542 | if (!unconfined(label)) { | |
543 | if (flags & MS_REMOUNT) | |
544 | error = aa_remount(label, path, flags, data); | |
545 | else if (flags & MS_BIND) | |
546 | error = aa_bind_mount(label, path, dev_name, flags); | |
547 | else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE | | |
548 | MS_UNBINDABLE)) | |
549 | error = aa_mount_change_type(label, path, flags); | |
550 | else if (flags & MS_MOVE) | |
551 | error = aa_move_mount(label, path, dev_name); | |
552 | else | |
553 | error = aa_new_mount(label, dev_name, path, type, | |
554 | flags, data); | |
555 | } | |
556 | __end_current_label_crit_section(label); | |
557 | ||
558 | return error; | |
559 | } | |
560 | ||
561 | static int apparmor_sb_umount(struct vfsmount *mnt, int flags) | |
562 | { | |
563 | struct aa_label *label; | |
564 | int error = 0; | |
565 | ||
566 | label = __begin_current_label_crit_section(); | |
567 | if (!unconfined(label)) | |
568 | error = aa_umount(label, mnt, flags); | |
569 | __end_current_label_crit_section(label); | |
570 | ||
571 | return error; | |
572 | } | |
573 | ||
574 | static int apparmor_sb_pivotroot(const struct path *old_path, | |
575 | const struct path *new_path) | |
576 | { | |
577 | struct aa_label *label; | |
578 | int error = 0; | |
579 | ||
580 | label = aa_get_current_label(); | |
581 | if (!unconfined(label)) | |
582 | error = aa_pivotroot(label, old_path, new_path); | |
583 | aa_put_label(label); | |
584 | ||
585 | return error; | |
586 | } | |
587 | ||
b5e95b48 JJ |
588 | static int apparmor_getprocattr(struct task_struct *task, char *name, |
589 | char **value) | |
590 | { | |
591 | int error = -ENOENT; | |
b5e95b48 JJ |
592 | /* released below */ |
593 | const struct cred *cred = get_task_cred(task); | |
de62de59 | 594 | struct aa_task_ctx *ctx = task_ctx(current); |
637f688d | 595 | struct aa_label *label = NULL; |
b5e95b48 JJ |
596 | |
597 | if (strcmp(name, "current") == 0) | |
d9087c49 | 598 | label = aa_get_newest_label(cred_label(cred)); |
55a26ebf | 599 | else if (strcmp(name, "prev") == 0 && ctx->previous) |
637f688d | 600 | label = aa_get_newest_label(ctx->previous); |
55a26ebf | 601 | else if (strcmp(name, "exec") == 0 && ctx->onexec) |
637f688d | 602 | label = aa_get_newest_label(ctx->onexec); |
b5e95b48 JJ |
603 | else |
604 | error = -EINVAL; | |
605 | ||
637f688d | 606 | if (label) |
76a1d263 | 607 | error = aa_getprocattr(label, value); |
77b071b3 | 608 | |
637f688d | 609 | aa_put_label(label); |
b5e95b48 JJ |
610 | put_cred(cred); |
611 | ||
612 | return error; | |
613 | } | |
614 | ||
b21507e2 SS |
615 | static int apparmor_setprocattr(const char *name, void *value, |
616 | size_t size) | |
b5e95b48 | 617 | { |
e89b8081 | 618 | char *command, *largs = NULL, *args = value; |
b5e95b48 JJ |
619 | size_t arg_size; |
620 | int error; | |
ef88a7ac | 621 | DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETPROCATTR); |
b5e95b48 JJ |
622 | |
623 | if (size == 0) | |
624 | return -EINVAL; | |
b5e95b48 | 625 | |
e89b8081 VN |
626 | /* AppArmor requires that the buffer must be null terminated atm */ |
627 | if (args[size - 1] != '\0') { | |
628 | /* null terminate */ | |
629 | largs = args = kmalloc(size + 1, GFP_KERNEL); | |
630 | if (!args) | |
631 | return -ENOMEM; | |
632 | memcpy(args, value, size); | |
633 | args[size] = '\0'; | |
634 | } | |
635 | ||
636 | error = -EINVAL; | |
b5e95b48 JJ |
637 | args = strim(args); |
638 | command = strsep(&args, " "); | |
639 | if (!args) | |
e89b8081 | 640 | goto out; |
b5e95b48 JJ |
641 | args = skip_spaces(args); |
642 | if (!*args) | |
e89b8081 | 643 | goto out; |
b5e95b48 | 644 | |
d4d03f74 | 645 | arg_size = size - (args - (largs ? largs : (char *) value)); |
b5e95b48 JJ |
646 | if (strcmp(name, "current") == 0) { |
647 | if (strcmp(command, "changehat") == 0) { | |
648 | error = aa_setprocattr_changehat(args, arg_size, | |
df8073c6 | 649 | AA_CHANGE_NOFLAGS); |
b5e95b48 JJ |
650 | } else if (strcmp(command, "permhat") == 0) { |
651 | error = aa_setprocattr_changehat(args, arg_size, | |
df8073c6 | 652 | AA_CHANGE_TEST); |
b5e95b48 | 653 | } else if (strcmp(command, "changeprofile") == 0) { |
df8073c6 | 654 | error = aa_change_profile(args, AA_CHANGE_NOFLAGS); |
b5e95b48 | 655 | } else if (strcmp(command, "permprofile") == 0) { |
df8073c6 | 656 | error = aa_change_profile(args, AA_CHANGE_TEST); |
6c5fc8f1 JJ |
657 | } else if (strcmp(command, "stack") == 0) { |
658 | error = aa_change_profile(args, AA_CHANGE_STACK); | |
3eea57c2 JJ |
659 | } else |
660 | goto fail; | |
b5e95b48 | 661 | } else if (strcmp(name, "exec") == 0) { |
3eea57c2 | 662 | if (strcmp(command, "exec") == 0) |
df8073c6 | 663 | error = aa_change_profile(args, AA_CHANGE_ONEXEC); |
6c5fc8f1 JJ |
664 | else if (strcmp(command, "stack") == 0) |
665 | error = aa_change_profile(args, (AA_CHANGE_ONEXEC | | |
666 | AA_CHANGE_STACK)); | |
3eea57c2 JJ |
667 | else |
668 | goto fail; | |
669 | } else | |
b5e95b48 | 670 | /* only support the "current" and "exec" process attributes */ |
e89b8081 | 671 | goto fail; |
3eea57c2 | 672 | |
b5e95b48 JJ |
673 | if (!error) |
674 | error = size; | |
e89b8081 VN |
675 | out: |
676 | kfree(largs); | |
b5e95b48 | 677 | return error; |
3eea57c2 JJ |
678 | |
679 | fail: | |
637f688d | 680 | aad(&sa)->label = begin_current_label_crit_section(); |
ef88a7ac JJ |
681 | aad(&sa)->info = name; |
682 | aad(&sa)->error = error = -EINVAL; | |
3eea57c2 | 683 | aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL); |
637f688d | 684 | end_current_label_crit_section(aad(&sa)->label); |
e89b8081 | 685 | goto out; |
b5e95b48 JJ |
686 | } |
687 | ||
fe864821 JJ |
688 | /** |
689 | * apparmor_bprm_committing_creds - do task cleanup on committing new creds | |
690 | * @bprm: binprm for the exec (NOT NULL) | |
691 | */ | |
692 | static void apparmor_bprm_committing_creds(struct linux_binprm *bprm) | |
693 | { | |
637f688d | 694 | struct aa_label *label = aa_current_raw_label(); |
d9087c49 | 695 | struct aa_label *new_label = cred_label(bprm->cred); |
fe864821 JJ |
696 | |
697 | /* bail out if unconfined or not changing profile */ | |
d9087c49 JJ |
698 | if ((new_label->proxy == label->proxy) || |
699 | (unconfined(new_label))) | |
fe864821 JJ |
700 | return; |
701 | ||
192ca6b5 JJ |
702 | aa_inherit_files(bprm->cred, current->files); |
703 | ||
fe864821 JJ |
704 | current->pdeath_signal = 0; |
705 | ||
637f688d | 706 | /* reset soft limits and set hard limits for the new label */ |
d9087c49 | 707 | __aa_transition_rlimits(label, new_label); |
fe864821 JJ |
708 | } |
709 | ||
710 | /** | |
711 | * apparmor_bprm_committed_cred - do cleanup after new creds committed | |
712 | * @bprm: binprm for the exec (NOT NULL) | |
713 | */ | |
714 | static void apparmor_bprm_committed_creds(struct linux_binprm *bprm) | |
715 | { | |
3b529a76 | 716 | /* clear out temporary/transitional state from the context */ |
de62de59 | 717 | aa_clear_task_ctx_trans(task_ctx(current)); |
3b529a76 | 718 | |
fe864821 JJ |
719 | return; |
720 | } | |
721 | ||
a7ae3645 JJ |
722 | static void apparmor_task_getsecid(struct task_struct *p, u32 *secid) |
723 | { | |
724 | struct aa_label *label = aa_get_task_label(p); | |
725 | *secid = label->secid; | |
726 | aa_put_label(label); | |
727 | } | |
728 | ||
7cb4dc9f JS |
729 | static int apparmor_task_setrlimit(struct task_struct *task, |
730 | unsigned int resource, struct rlimit *new_rlim) | |
b5e95b48 | 731 | { |
637f688d | 732 | struct aa_label *label = __begin_current_label_crit_section(); |
b5e95b48 JJ |
733 | int error = 0; |
734 | ||
637f688d | 735 | if (!unconfined(label)) |
86b92cb7 | 736 | error = aa_task_setrlimit(label, task, resource, new_rlim); |
637f688d | 737 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
738 | |
739 | return error; | |
740 | } | |
741 | ||
ae7795bc | 742 | static int apparmor_task_kill(struct task_struct *target, struct kernel_siginfo *info, |
6b4f3d01 | 743 | int sig, const struct cred *cred) |
cd1dbf76 JJ |
744 | { |
745 | struct aa_label *cl, *tl; | |
746 | int error; | |
747 | ||
6b4f3d01 SS |
748 | if (cred) { |
749 | /* | |
750 | * Dealing with USB IO specific behavior | |
cd1dbf76 | 751 | */ |
6b4f3d01 SS |
752 | cl = aa_get_newest_cred_label(cred); |
753 | tl = aa_get_task_label(target); | |
754 | error = aa_may_signal(cl, tl, sig); | |
755 | aa_put_label(cl); | |
756 | aa_put_label(tl); | |
757 | return error; | |
758 | } | |
759 | ||
cd1dbf76 JJ |
760 | cl = __begin_current_label_crit_section(); |
761 | tl = aa_get_task_label(target); | |
762 | error = aa_may_signal(cl, tl, sig); | |
763 | aa_put_label(tl); | |
764 | __end_current_label_crit_section(cl); | |
765 | ||
766 | return error; | |
767 | } | |
768 | ||
56974a6f JJ |
769 | /** |
770 | * apparmor_sk_alloc_security - allocate and attach the sk_security field | |
771 | */ | |
772 | static int apparmor_sk_alloc_security(struct sock *sk, int family, gfp_t flags) | |
773 | { | |
774 | struct aa_sk_ctx *ctx; | |
775 | ||
776 | ctx = kzalloc(sizeof(*ctx), flags); | |
777 | if (!ctx) | |
778 | return -ENOMEM; | |
779 | ||
780 | SK_CTX(sk) = ctx; | |
781 | ||
782 | return 0; | |
783 | } | |
784 | ||
785 | /** | |
786 | * apparmor_sk_free_security - free the sk_security field | |
787 | */ | |
788 | static void apparmor_sk_free_security(struct sock *sk) | |
789 | { | |
790 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
791 | ||
792 | SK_CTX(sk) = NULL; | |
793 | aa_put_label(ctx->label); | |
794 | aa_put_label(ctx->peer); | |
795 | kfree(ctx); | |
796 | } | |
797 | ||
798 | /** | |
799 | * apparmor_clone_security - clone the sk_security field | |
800 | */ | |
801 | static void apparmor_sk_clone_security(const struct sock *sk, | |
802 | struct sock *newsk) | |
803 | { | |
804 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
805 | struct aa_sk_ctx *new = SK_CTX(newsk); | |
806 | ||
807 | new->label = aa_get_label(ctx->label); | |
808 | new->peer = aa_get_label(ctx->peer); | |
809 | } | |
810 | ||
811 | /** | |
812 | * apparmor_socket_create - check perms before creating a new socket | |
813 | */ | |
814 | static int apparmor_socket_create(int family, int type, int protocol, int kern) | |
815 | { | |
816 | struct aa_label *label; | |
817 | int error = 0; | |
818 | ||
819 | AA_BUG(in_interrupt()); | |
820 | ||
821 | label = begin_current_label_crit_section(); | |
822 | if (!(kern || unconfined(label))) | |
823 | error = af_select(family, | |
824 | create_perm(label, family, type, protocol), | |
825 | aa_af_perm(label, OP_CREATE, AA_MAY_CREATE, | |
826 | family, type, protocol)); | |
827 | end_current_label_crit_section(label); | |
828 | ||
829 | return error; | |
830 | } | |
831 | ||
832 | /** | |
833 | * apparmor_socket_post_create - setup the per-socket security struct | |
834 | * | |
835 | * Note: | |
836 | * - kernel sockets currently labeled unconfined but we may want to | |
837 | * move to a special kernel label | |
838 | * - socket may not have sk here if created with sock_create_lite or | |
839 | * sock_alloc. These should be accept cases which will be handled in | |
840 | * sock_graft. | |
841 | */ | |
842 | static int apparmor_socket_post_create(struct socket *sock, int family, | |
843 | int type, int protocol, int kern) | |
844 | { | |
845 | struct aa_label *label; | |
846 | ||
847 | if (kern) { | |
848 | struct aa_ns *ns = aa_get_current_ns(); | |
849 | ||
850 | label = aa_get_label(ns_unconfined(ns)); | |
851 | aa_put_ns(ns); | |
852 | } else | |
853 | label = aa_get_current_label(); | |
854 | ||
855 | if (sock->sk) { | |
856 | struct aa_sk_ctx *ctx = SK_CTX(sock->sk); | |
857 | ||
858 | aa_put_label(ctx->label); | |
859 | ctx->label = aa_get_label(label); | |
860 | } | |
861 | aa_put_label(label); | |
862 | ||
863 | return 0; | |
864 | } | |
865 | ||
866 | /** | |
867 | * apparmor_socket_bind - check perms before bind addr to socket | |
868 | */ | |
869 | static int apparmor_socket_bind(struct socket *sock, | |
870 | struct sockaddr *address, int addrlen) | |
871 | { | |
872 | AA_BUG(!sock); | |
873 | AA_BUG(!sock->sk); | |
874 | AA_BUG(!address); | |
875 | AA_BUG(in_interrupt()); | |
876 | ||
877 | return af_select(sock->sk->sk_family, | |
878 | bind_perm(sock, address, addrlen), | |
879 | aa_sk_perm(OP_BIND, AA_MAY_BIND, sock->sk)); | |
880 | } | |
881 | ||
882 | /** | |
883 | * apparmor_socket_connect - check perms before connecting @sock to @address | |
884 | */ | |
885 | static int apparmor_socket_connect(struct socket *sock, | |
886 | struct sockaddr *address, int addrlen) | |
887 | { | |
888 | AA_BUG(!sock); | |
889 | AA_BUG(!sock->sk); | |
890 | AA_BUG(!address); | |
891 | AA_BUG(in_interrupt()); | |
892 | ||
893 | return af_select(sock->sk->sk_family, | |
894 | connect_perm(sock, address, addrlen), | |
895 | aa_sk_perm(OP_CONNECT, AA_MAY_CONNECT, sock->sk)); | |
896 | } | |
897 | ||
898 | /** | |
899 | * apparmor_socket_list - check perms before allowing listen | |
900 | */ | |
901 | static int apparmor_socket_listen(struct socket *sock, int backlog) | |
902 | { | |
903 | AA_BUG(!sock); | |
904 | AA_BUG(!sock->sk); | |
905 | AA_BUG(in_interrupt()); | |
906 | ||
907 | return af_select(sock->sk->sk_family, | |
908 | listen_perm(sock, backlog), | |
909 | aa_sk_perm(OP_LISTEN, AA_MAY_LISTEN, sock->sk)); | |
910 | } | |
911 | ||
912 | /** | |
913 | * apparmor_socket_accept - check perms before accepting a new connection. | |
914 | * | |
915 | * Note: while @newsock is created and has some information, the accept | |
916 | * has not been done. | |
917 | */ | |
918 | static int apparmor_socket_accept(struct socket *sock, struct socket *newsock) | |
919 | { | |
920 | AA_BUG(!sock); | |
921 | AA_BUG(!sock->sk); | |
922 | AA_BUG(!newsock); | |
923 | AA_BUG(in_interrupt()); | |
924 | ||
925 | return af_select(sock->sk->sk_family, | |
926 | accept_perm(sock, newsock), | |
927 | aa_sk_perm(OP_ACCEPT, AA_MAY_ACCEPT, sock->sk)); | |
928 | } | |
929 | ||
930 | static int aa_sock_msg_perm(const char *op, u32 request, struct socket *sock, | |
931 | struct msghdr *msg, int size) | |
932 | { | |
933 | AA_BUG(!sock); | |
934 | AA_BUG(!sock->sk); | |
935 | AA_BUG(!msg); | |
936 | AA_BUG(in_interrupt()); | |
937 | ||
938 | return af_select(sock->sk->sk_family, | |
939 | msg_perm(op, request, sock, msg, size), | |
940 | aa_sk_perm(op, request, sock->sk)); | |
941 | } | |
942 | ||
943 | /** | |
944 | * apparmor_socket_sendmsg - check perms before sending msg to another socket | |
945 | */ | |
946 | static int apparmor_socket_sendmsg(struct socket *sock, | |
947 | struct msghdr *msg, int size) | |
948 | { | |
949 | return aa_sock_msg_perm(OP_SENDMSG, AA_MAY_SEND, sock, msg, size); | |
950 | } | |
951 | ||
952 | /** | |
953 | * apparmor_socket_recvmsg - check perms before receiving a message | |
954 | */ | |
955 | static int apparmor_socket_recvmsg(struct socket *sock, | |
956 | struct msghdr *msg, int size, int flags) | |
957 | { | |
958 | return aa_sock_msg_perm(OP_RECVMSG, AA_MAY_RECEIVE, sock, msg, size); | |
959 | } | |
960 | ||
961 | /* revaliation, get/set attr, shutdown */ | |
962 | static int aa_sock_perm(const char *op, u32 request, struct socket *sock) | |
963 | { | |
964 | AA_BUG(!sock); | |
965 | AA_BUG(!sock->sk); | |
966 | AA_BUG(in_interrupt()); | |
967 | ||
968 | return af_select(sock->sk->sk_family, | |
969 | sock_perm(op, request, sock), | |
970 | aa_sk_perm(op, request, sock->sk)); | |
971 | } | |
972 | ||
973 | /** | |
974 | * apparmor_socket_getsockname - check perms before getting the local address | |
975 | */ | |
976 | static int apparmor_socket_getsockname(struct socket *sock) | |
977 | { | |
978 | return aa_sock_perm(OP_GETSOCKNAME, AA_MAY_GETATTR, sock); | |
979 | } | |
980 | ||
981 | /** | |
982 | * apparmor_socket_getpeername - check perms before getting remote address | |
983 | */ | |
984 | static int apparmor_socket_getpeername(struct socket *sock) | |
985 | { | |
986 | return aa_sock_perm(OP_GETPEERNAME, AA_MAY_GETATTR, sock); | |
987 | } | |
988 | ||
989 | /* revaliation, get/set attr, opt */ | |
990 | static int aa_sock_opt_perm(const char *op, u32 request, struct socket *sock, | |
991 | int level, int optname) | |
992 | { | |
993 | AA_BUG(!sock); | |
994 | AA_BUG(!sock->sk); | |
995 | AA_BUG(in_interrupt()); | |
996 | ||
997 | return af_select(sock->sk->sk_family, | |
998 | opt_perm(op, request, sock, level, optname), | |
999 | aa_sk_perm(op, request, sock->sk)); | |
1000 | } | |
1001 | ||
1002 | /** | |
1003 | * apparmor_getsockopt - check perms before getting socket options | |
1004 | */ | |
1005 | static int apparmor_socket_getsockopt(struct socket *sock, int level, | |
1006 | int optname) | |
1007 | { | |
1008 | return aa_sock_opt_perm(OP_GETSOCKOPT, AA_MAY_GETOPT, sock, | |
1009 | level, optname); | |
1010 | } | |
1011 | ||
1012 | /** | |
1013 | * apparmor_setsockopt - check perms before setting socket options | |
1014 | */ | |
1015 | static int apparmor_socket_setsockopt(struct socket *sock, int level, | |
1016 | int optname) | |
1017 | { | |
1018 | return aa_sock_opt_perm(OP_SETSOCKOPT, AA_MAY_SETOPT, sock, | |
1019 | level, optname); | |
1020 | } | |
1021 | ||
1022 | /** | |
1023 | * apparmor_socket_shutdown - check perms before shutting down @sock conn | |
1024 | */ | |
1025 | static int apparmor_socket_shutdown(struct socket *sock, int how) | |
1026 | { | |
1027 | return aa_sock_perm(OP_SHUTDOWN, AA_MAY_SHUTDOWN, sock); | |
1028 | } | |
1029 | ||
e1af4779 | 1030 | #ifdef CONFIG_NETWORK_SECMARK |
56974a6f JJ |
1031 | /** |
1032 | * apparmor_socket_sock_recv_skb - check perms before associating skb to sk | |
1033 | * | |
1034 | * Note: can not sleep may be called with locks held | |
1035 | * | |
1036 | * dont want protocol specific in __skb_recv_datagram() | |
1037 | * to deny an incoming connection socket_sock_rcv_skb() | |
1038 | */ | |
1039 | static int apparmor_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
1040 | { | |
ab9f2115 MG |
1041 | struct aa_sk_ctx *ctx = SK_CTX(sk); |
1042 | ||
1043 | if (!skb->secmark) | |
1044 | return 0; | |
1045 | ||
1046 | return apparmor_secmark_check(ctx->label, OP_RECVMSG, AA_MAY_RECEIVE, | |
1047 | skb->secmark, sk); | |
56974a6f | 1048 | } |
e1af4779 | 1049 | #endif |
56974a6f JJ |
1050 | |
1051 | ||
1052 | static struct aa_label *sk_peer_label(struct sock *sk) | |
1053 | { | |
1054 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
1055 | ||
1056 | if (ctx->peer) | |
1057 | return ctx->peer; | |
1058 | ||
1059 | return ERR_PTR(-ENOPROTOOPT); | |
1060 | } | |
1061 | ||
1062 | /** | |
1063 | * apparmor_socket_getpeersec_stream - get security context of peer | |
1064 | * | |
1065 | * Note: for tcp only valid if using ipsec or cipso on lan | |
1066 | */ | |
1067 | static int apparmor_socket_getpeersec_stream(struct socket *sock, | |
1068 | char __user *optval, | |
1069 | int __user *optlen, | |
1070 | unsigned int len) | |
1071 | { | |
1072 | char *name; | |
1073 | int slen, error = 0; | |
1074 | struct aa_label *label; | |
1075 | struct aa_label *peer; | |
1076 | ||
1077 | label = begin_current_label_crit_section(); | |
1078 | peer = sk_peer_label(sock->sk); | |
1079 | if (IS_ERR(peer)) { | |
1080 | error = PTR_ERR(peer); | |
1081 | goto done; | |
1082 | } | |
1083 | slen = aa_label_asxprint(&name, labels_ns(label), peer, | |
1084 | FLAG_SHOW_MODE | FLAG_VIEW_SUBNS | | |
1085 | FLAG_HIDDEN_UNCONFINED, GFP_KERNEL); | |
1086 | /* don't include terminating \0 in slen, it breaks some apps */ | |
1087 | if (slen < 0) { | |
1088 | error = -ENOMEM; | |
1089 | } else { | |
1090 | if (slen > len) { | |
1091 | error = -ERANGE; | |
1092 | } else if (copy_to_user(optval, name, slen)) { | |
1093 | error = -EFAULT; | |
1094 | goto out; | |
1095 | } | |
1096 | if (put_user(slen, optlen)) | |
1097 | error = -EFAULT; | |
1098 | out: | |
1099 | kfree(name); | |
1100 | ||
1101 | } | |
1102 | ||
1103 | done: | |
1104 | end_current_label_crit_section(label); | |
1105 | ||
1106 | return error; | |
1107 | } | |
1108 | ||
1109 | /** | |
1110 | * apparmor_socket_getpeersec_dgram - get security label of packet | |
1111 | * @sock: the peer socket | |
1112 | * @skb: packet data | |
1113 | * @secid: pointer to where to put the secid of the packet | |
1114 | * | |
1115 | * Sets the netlabel socket state on sk from parent | |
1116 | */ | |
1117 | static int apparmor_socket_getpeersec_dgram(struct socket *sock, | |
1118 | struct sk_buff *skb, u32 *secid) | |
1119 | ||
1120 | { | |
1121 | /* TODO: requires secid support */ | |
1122 | return -ENOPROTOOPT; | |
1123 | } | |
1124 | ||
1125 | /** | |
1126 | * apparmor_sock_graft - Initialize newly created socket | |
1127 | * @sk: child sock | |
1128 | * @parent: parent socket | |
1129 | * | |
1130 | * Note: could set off of SOCK_CTX(parent) but need to track inode and we can | |
1131 | * just set sk security information off of current creating process label | |
1132 | * Labeling of sk for accept case - probably should be sock based | |
1133 | * instead of task, because of the case where an implicitly labeled | |
1134 | * socket is shared by different tasks. | |
1135 | */ | |
1136 | static void apparmor_sock_graft(struct sock *sk, struct socket *parent) | |
1137 | { | |
1138 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
1139 | ||
1140 | if (!ctx->label) | |
1141 | ctx->label = aa_get_current_label(); | |
1142 | } | |
1143 | ||
e1af4779 | 1144 | #ifdef CONFIG_NETWORK_SECMARK |
ab9f2115 MG |
1145 | static int apparmor_inet_conn_request(struct sock *sk, struct sk_buff *skb, |
1146 | struct request_sock *req) | |
1147 | { | |
1148 | struct aa_sk_ctx *ctx = SK_CTX(sk); | |
1149 | ||
1150 | if (!skb->secmark) | |
1151 | return 0; | |
1152 | ||
1153 | return apparmor_secmark_check(ctx->label, OP_CONNECT, AA_MAY_CONNECT, | |
1154 | skb->secmark, sk); | |
1155 | } | |
e1af4779 | 1156 | #endif |
ab9f2115 | 1157 | |
bbd3662a CS |
1158 | /* |
1159 | * The cred blob is a pointer to, not an instance of, an aa_task_ctx. | |
1160 | */ | |
1161 | struct lsm_blob_sizes apparmor_blob_sizes __lsm_ro_after_init = { | |
1162 | .lbs_cred = sizeof(struct aa_task_ctx *), | |
33bf60ca | 1163 | .lbs_file = sizeof(struct aa_file_ctx), |
f4ad8f2c | 1164 | .lbs_task = sizeof(struct aa_task_ctx), |
bbd3662a CS |
1165 | }; |
1166 | ||
ca97d939 | 1167 | static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = { |
e20b043a CS |
1168 | LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check), |
1169 | LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme), | |
1170 | LSM_HOOK_INIT(capget, apparmor_capget), | |
1171 | LSM_HOOK_INIT(capable, apparmor_capable), | |
1172 | ||
2ea3ffb7 JJ |
1173 | LSM_HOOK_INIT(sb_mount, apparmor_sb_mount), |
1174 | LSM_HOOK_INIT(sb_umount, apparmor_sb_umount), | |
1175 | LSM_HOOK_INIT(sb_pivotroot, apparmor_sb_pivotroot), | |
1176 | ||
e20b043a CS |
1177 | LSM_HOOK_INIT(path_link, apparmor_path_link), |
1178 | LSM_HOOK_INIT(path_unlink, apparmor_path_unlink), | |
1179 | LSM_HOOK_INIT(path_symlink, apparmor_path_symlink), | |
1180 | LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir), | |
1181 | LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir), | |
1182 | LSM_HOOK_INIT(path_mknod, apparmor_path_mknod), | |
1183 | LSM_HOOK_INIT(path_rename, apparmor_path_rename), | |
1184 | LSM_HOOK_INIT(path_chmod, apparmor_path_chmod), | |
1185 | LSM_HOOK_INIT(path_chown, apparmor_path_chown), | |
1186 | LSM_HOOK_INIT(path_truncate, apparmor_path_truncate), | |
1187 | LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr), | |
1188 | ||
1189 | LSM_HOOK_INIT(file_open, apparmor_file_open), | |
064dc947 | 1190 | LSM_HOOK_INIT(file_receive, apparmor_file_receive), |
e20b043a CS |
1191 | LSM_HOOK_INIT(file_permission, apparmor_file_permission), |
1192 | LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security), | |
1193 | LSM_HOOK_INIT(file_free_security, apparmor_file_free_security), | |
1194 | LSM_HOOK_INIT(mmap_file, apparmor_mmap_file), | |
e20b043a CS |
1195 | LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect), |
1196 | LSM_HOOK_INIT(file_lock, apparmor_file_lock), | |
1197 | ||
1198 | LSM_HOOK_INIT(getprocattr, apparmor_getprocattr), | |
1199 | LSM_HOOK_INIT(setprocattr, apparmor_setprocattr), | |
1200 | ||
56974a6f JJ |
1201 | LSM_HOOK_INIT(sk_alloc_security, apparmor_sk_alloc_security), |
1202 | LSM_HOOK_INIT(sk_free_security, apparmor_sk_free_security), | |
1203 | LSM_HOOK_INIT(sk_clone_security, apparmor_sk_clone_security), | |
1204 | ||
1205 | LSM_HOOK_INIT(socket_create, apparmor_socket_create), | |
1206 | LSM_HOOK_INIT(socket_post_create, apparmor_socket_post_create), | |
1207 | LSM_HOOK_INIT(socket_bind, apparmor_socket_bind), | |
1208 | LSM_HOOK_INIT(socket_connect, apparmor_socket_connect), | |
1209 | LSM_HOOK_INIT(socket_listen, apparmor_socket_listen), | |
1210 | LSM_HOOK_INIT(socket_accept, apparmor_socket_accept), | |
1211 | LSM_HOOK_INIT(socket_sendmsg, apparmor_socket_sendmsg), | |
1212 | LSM_HOOK_INIT(socket_recvmsg, apparmor_socket_recvmsg), | |
1213 | LSM_HOOK_INIT(socket_getsockname, apparmor_socket_getsockname), | |
1214 | LSM_HOOK_INIT(socket_getpeername, apparmor_socket_getpeername), | |
1215 | LSM_HOOK_INIT(socket_getsockopt, apparmor_socket_getsockopt), | |
1216 | LSM_HOOK_INIT(socket_setsockopt, apparmor_socket_setsockopt), | |
1217 | LSM_HOOK_INIT(socket_shutdown, apparmor_socket_shutdown), | |
e1af4779 | 1218 | #ifdef CONFIG_NETWORK_SECMARK |
56974a6f | 1219 | LSM_HOOK_INIT(socket_sock_rcv_skb, apparmor_socket_sock_rcv_skb), |
e1af4779 | 1220 | #endif |
56974a6f JJ |
1221 | LSM_HOOK_INIT(socket_getpeersec_stream, |
1222 | apparmor_socket_getpeersec_stream), | |
1223 | LSM_HOOK_INIT(socket_getpeersec_dgram, | |
1224 | apparmor_socket_getpeersec_dgram), | |
1225 | LSM_HOOK_INIT(sock_graft, apparmor_sock_graft), | |
e1af4779 | 1226 | #ifdef CONFIG_NETWORK_SECMARK |
ab9f2115 | 1227 | LSM_HOOK_INIT(inet_conn_request, apparmor_inet_conn_request), |
e1af4779 | 1228 | #endif |
56974a6f | 1229 | |
e20b043a CS |
1230 | LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank), |
1231 | LSM_HOOK_INIT(cred_free, apparmor_cred_free), | |
1232 | LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare), | |
1233 | LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer), | |
1234 | ||
1235 | LSM_HOOK_INIT(bprm_set_creds, apparmor_bprm_set_creds), | |
1236 | LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds), | |
1237 | LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds), | |
e20b043a | 1238 | |
3b529a76 JJ |
1239 | LSM_HOOK_INIT(task_free, apparmor_task_free), |
1240 | LSM_HOOK_INIT(task_alloc, apparmor_task_alloc), | |
a7ae3645 | 1241 | LSM_HOOK_INIT(task_getsecid, apparmor_task_getsecid), |
e20b043a | 1242 | LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit), |
cd1dbf76 | 1243 | LSM_HOOK_INIT(task_kill, apparmor_task_kill), |
c0929212 | 1244 | |
e79c26d0 MG |
1245 | #ifdef CONFIG_AUDIT |
1246 | LSM_HOOK_INIT(audit_rule_init, aa_audit_rule_init), | |
1247 | LSM_HOOK_INIT(audit_rule_known, aa_audit_rule_known), | |
1248 | LSM_HOOK_INIT(audit_rule_match, aa_audit_rule_match), | |
1249 | LSM_HOOK_INIT(audit_rule_free, aa_audit_rule_free), | |
1250 | #endif | |
1251 | ||
c0929212 JJ |
1252 | LSM_HOOK_INIT(secid_to_secctx, apparmor_secid_to_secctx), |
1253 | LSM_HOOK_INIT(secctx_to_secid, apparmor_secctx_to_secid), | |
1254 | LSM_HOOK_INIT(release_secctx, apparmor_release_secctx), | |
b5e95b48 JJ |
1255 | }; |
1256 | ||
1257 | /* | |
1258 | * AppArmor sysfs module parameters | |
1259 | */ | |
1260 | ||
101d6c82 SR |
1261 | static int param_set_aabool(const char *val, const struct kernel_param *kp); |
1262 | static int param_get_aabool(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 1263 | #define param_check_aabool param_check_bool |
9c27847d | 1264 | static const struct kernel_param_ops param_ops_aabool = { |
6a4c2643 | 1265 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
1266 | .set = param_set_aabool, |
1267 | .get = param_get_aabool | |
1268 | }; | |
b5e95b48 | 1269 | |
101d6c82 SR |
1270 | static int param_set_aauint(const char *val, const struct kernel_param *kp); |
1271 | static int param_get_aauint(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 1272 | #define param_check_aauint param_check_uint |
9c27847d | 1273 | static const struct kernel_param_ops param_ops_aauint = { |
101d6c82 SR |
1274 | .set = param_set_aauint, |
1275 | .get = param_get_aauint | |
1276 | }; | |
b5e95b48 | 1277 | |
63c16c3a CC |
1278 | static int param_set_aacompressionlevel(const char *val, |
1279 | const struct kernel_param *kp); | |
1280 | static int param_get_aacompressionlevel(char *buffer, | |
1281 | const struct kernel_param *kp); | |
1282 | #define param_check_aacompressionlevel param_check_int | |
1283 | static const struct kernel_param_ops param_ops_aacompressionlevel = { | |
1284 | .set = param_set_aacompressionlevel, | |
1285 | .get = param_get_aacompressionlevel | |
1286 | }; | |
1287 | ||
101d6c82 SR |
1288 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp); |
1289 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 1290 | #define param_check_aalockpolicy param_check_bool |
9c27847d | 1291 | static const struct kernel_param_ops param_ops_aalockpolicy = { |
6a4c2643 | 1292 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
1293 | .set = param_set_aalockpolicy, |
1294 | .get = param_get_aalockpolicy | |
1295 | }; | |
b5e95b48 | 1296 | |
e4dca7b7 KC |
1297 | static int param_set_audit(const char *val, const struct kernel_param *kp); |
1298 | static int param_get_audit(char *buffer, const struct kernel_param *kp); | |
b5e95b48 | 1299 | |
e4dca7b7 KC |
1300 | static int param_set_mode(const char *val, const struct kernel_param *kp); |
1301 | static int param_get_mode(char *buffer, const struct kernel_param *kp); | |
b5e95b48 JJ |
1302 | |
1303 | /* Flag values, also controllable via /sys/module/apparmor/parameters | |
1304 | * We define special types as we want to do additional mediation. | |
1305 | */ | |
1306 | ||
1307 | /* AppArmor global enforcement switch - complain, enforce, kill */ | |
1308 | enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE; | |
1309 | module_param_call(mode, param_set_mode, param_get_mode, | |
1310 | &aa_g_profile_mode, S_IRUSR | S_IWUSR); | |
1311 | ||
6059f71f | 1312 | /* whether policy verification hashing is enabled */ |
7616ac70 | 1313 | bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT); |
3ccb76c5 | 1314 | #ifdef CONFIG_SECURITY_APPARMOR_HASH |
6059f71f | 1315 | module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR); |
7616ac70 | 1316 | #endif |
6059f71f | 1317 | |
63c16c3a CC |
1318 | /* policy loaddata compression level */ |
1319 | int aa_g_rawdata_compression_level = Z_DEFAULT_COMPRESSION; | |
1320 | module_param_named(rawdata_compression_level, aa_g_rawdata_compression_level, | |
1321 | aacompressionlevel, 0400); | |
1322 | ||
b5e95b48 | 1323 | /* Debug mode */ |
eea7a05f | 1324 | bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES); |
b5e95b48 JJ |
1325 | module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR); |
1326 | ||
1327 | /* Audit mode */ | |
1328 | enum audit_mode aa_g_audit; | |
1329 | module_param_call(audit, param_set_audit, param_get_audit, | |
1330 | &aa_g_audit, S_IRUSR | S_IWUSR); | |
1331 | ||
1332 | /* Determines if audit header is included in audited messages. This | |
1333 | * provides more context if the audit daemon is not running | |
1334 | */ | |
954317fe | 1335 | bool aa_g_audit_header = true; |
b5e95b48 JJ |
1336 | module_param_named(audit_header, aa_g_audit_header, aabool, |
1337 | S_IRUSR | S_IWUSR); | |
1338 | ||
1339 | /* lock out loading/removal of policy | |
1340 | * TODO: add in at boot loading of policy, which is the only way to | |
1341 | * load policy, if lock_policy is set | |
1342 | */ | |
90ab5ee9 | 1343 | bool aa_g_lock_policy; |
b5e95b48 JJ |
1344 | module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy, |
1345 | S_IRUSR | S_IWUSR); | |
1346 | ||
1347 | /* Syscall logging mode */ | |
90ab5ee9 | 1348 | bool aa_g_logsyscall; |
b5e95b48 JJ |
1349 | module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR); |
1350 | ||
1351 | /* Maximum pathname length before accesses will start getting rejected */ | |
1352 | unsigned int aa_g_path_max = 2 * PATH_MAX; | |
622f6e32 | 1353 | module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR); |
b5e95b48 JJ |
1354 | |
1355 | /* Determines how paranoid loading of policy is and how much verification | |
1356 | * on the loaded policy is done. | |
abbf8734 JJ |
1357 | * DEPRECATED: read only as strict checking of load is always done now |
1358 | * that none root users (user namespaces) can load policy. | |
b5e95b48 | 1359 | */ |
954317fe | 1360 | bool aa_g_paranoid_load = true; |
abbf8734 | 1361 | module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO); |
b5e95b48 | 1362 | |
e33c1b99 KC |
1363 | static int param_get_aaintbool(char *buffer, const struct kernel_param *kp); |
1364 | static int param_set_aaintbool(const char *val, const struct kernel_param *kp); | |
1365 | #define param_check_aaintbool param_check_int | |
1366 | static const struct kernel_param_ops param_ops_aaintbool = { | |
1367 | .set = param_set_aaintbool, | |
1368 | .get = param_get_aaintbool | |
1369 | }; | |
b5e95b48 | 1370 | /* Boot time disable flag */ |
0102fb83 | 1371 | static int apparmor_enabled __lsm_ro_after_init = 1; |
e33c1b99 | 1372 | module_param_named(enabled, apparmor_enabled, aaintbool, 0444); |
b5e95b48 JJ |
1373 | |
1374 | static int __init apparmor_enabled_setup(char *str) | |
1375 | { | |
1376 | unsigned long enabled; | |
29707b20 | 1377 | int error = kstrtoul(str, 0, &enabled); |
b5e95b48 JJ |
1378 | if (!error) |
1379 | apparmor_enabled = enabled ? 1 : 0; | |
1380 | return 1; | |
1381 | } | |
1382 | ||
1383 | __setup("apparmor=", apparmor_enabled_setup); | |
1384 | ||
1385 | /* set global flag turning off the ability to load policy */ | |
101d6c82 | 1386 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp) |
b5e95b48 | 1387 | { |
545de8fe JJ |
1388 | if (!apparmor_enabled) |
1389 | return -EINVAL; | |
1390 | if (apparmor_initialized && !policy_admin_capable(NULL)) | |
b5e95b48 | 1391 | return -EPERM; |
b5e95b48 JJ |
1392 | return param_set_bool(val, kp); |
1393 | } | |
1394 | ||
101d6c82 | 1395 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1396 | { |
ca4bd5ae JJ |
1397 | if (!apparmor_enabled) |
1398 | return -EINVAL; | |
545de8fe JJ |
1399 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1400 | return -EPERM; | |
b5e95b48 JJ |
1401 | return param_get_bool(buffer, kp); |
1402 | } | |
1403 | ||
101d6c82 | 1404 | static int param_set_aabool(const char *val, const struct kernel_param *kp) |
b5e95b48 | 1405 | { |
ca4bd5ae JJ |
1406 | if (!apparmor_enabled) |
1407 | return -EINVAL; | |
545de8fe JJ |
1408 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
1409 | return -EPERM; | |
b5e95b48 JJ |
1410 | return param_set_bool(val, kp); |
1411 | } | |
1412 | ||
101d6c82 | 1413 | static int param_get_aabool(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1414 | { |
ca4bd5ae JJ |
1415 | if (!apparmor_enabled) |
1416 | return -EINVAL; | |
545de8fe JJ |
1417 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1418 | return -EPERM; | |
b5e95b48 JJ |
1419 | return param_get_bool(buffer, kp); |
1420 | } | |
1421 | ||
101d6c82 | 1422 | static int param_set_aauint(const char *val, const struct kernel_param *kp) |
b5e95b48 | 1423 | { |
39d84824 JJ |
1424 | int error; |
1425 | ||
ca4bd5ae JJ |
1426 | if (!apparmor_enabled) |
1427 | return -EINVAL; | |
39d84824 JJ |
1428 | /* file is ro but enforce 2nd line check */ |
1429 | if (apparmor_initialized) | |
545de8fe | 1430 | return -EPERM; |
39d84824 JJ |
1431 | |
1432 | error = param_set_uint(val, kp); | |
df323337 | 1433 | aa_g_path_max = max_t(uint32_t, aa_g_path_max, sizeof(union aa_buffer)); |
39d84824 JJ |
1434 | pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max); |
1435 | ||
1436 | return error; | |
b5e95b48 JJ |
1437 | } |
1438 | ||
101d6c82 | 1439 | static int param_get_aauint(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1440 | { |
ca4bd5ae JJ |
1441 | if (!apparmor_enabled) |
1442 | return -EINVAL; | |
545de8fe JJ |
1443 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1444 | return -EPERM; | |
b5e95b48 JJ |
1445 | return param_get_uint(buffer, kp); |
1446 | } | |
1447 | ||
e33c1b99 KC |
1448 | /* Can only be set before AppArmor is initialized (i.e. on boot cmdline). */ |
1449 | static int param_set_aaintbool(const char *val, const struct kernel_param *kp) | |
1450 | { | |
1451 | struct kernel_param kp_local; | |
1452 | bool value; | |
1453 | int error; | |
1454 | ||
1455 | if (apparmor_initialized) | |
1456 | return -EPERM; | |
1457 | ||
1458 | /* Create local copy, with arg pointing to bool type. */ | |
1459 | value = !!*((int *)kp->arg); | |
1460 | memcpy(&kp_local, kp, sizeof(kp_local)); | |
1461 | kp_local.arg = &value; | |
1462 | ||
1463 | error = param_set_bool(val, &kp_local); | |
1464 | if (!error) | |
1465 | *((int *)kp->arg) = *((bool *)kp_local.arg); | |
1466 | return error; | |
1467 | } | |
1468 | ||
1469 | /* | |
1470 | * To avoid changing /sys/module/apparmor/parameters/enabled from Y/N to | |
1471 | * 1/0, this converts the "int that is actually bool" back to bool for | |
1472 | * display in the /sys filesystem, while keeping it "int" for the LSM | |
1473 | * infrastructure. | |
1474 | */ | |
1475 | static int param_get_aaintbool(char *buffer, const struct kernel_param *kp) | |
1476 | { | |
1477 | struct kernel_param kp_local; | |
1478 | bool value; | |
1479 | ||
1480 | /* Create local copy, with arg pointing to bool type. */ | |
1481 | value = !!*((int *)kp->arg); | |
1482 | memcpy(&kp_local, kp, sizeof(kp_local)); | |
1483 | kp_local.arg = &value; | |
1484 | ||
1485 | return param_get_bool(buffer, &kp_local); | |
1486 | } | |
1487 | ||
63c16c3a CC |
1488 | static int param_set_aacompressionlevel(const char *val, |
1489 | const struct kernel_param *kp) | |
1490 | { | |
1491 | int error; | |
1492 | ||
1493 | if (!apparmor_enabled) | |
1494 | return -EINVAL; | |
1495 | if (apparmor_initialized) | |
1496 | return -EPERM; | |
1497 | ||
1498 | error = param_set_int(val, kp); | |
1499 | ||
1500 | aa_g_rawdata_compression_level = clamp(aa_g_rawdata_compression_level, | |
1501 | Z_NO_COMPRESSION, | |
1502 | Z_BEST_COMPRESSION); | |
1503 | pr_info("AppArmor: policy rawdata compression level set to %u\n", | |
1504 | aa_g_rawdata_compression_level); | |
1505 | ||
1506 | return error; | |
1507 | } | |
1508 | ||
1509 | static int param_get_aacompressionlevel(char *buffer, | |
1510 | const struct kernel_param *kp) | |
1511 | { | |
1512 | if (!apparmor_enabled) | |
1513 | return -EINVAL; | |
1514 | if (apparmor_initialized && !policy_view_capable(NULL)) | |
1515 | return -EPERM; | |
1516 | return param_get_int(buffer, kp); | |
1517 | } | |
1518 | ||
e4dca7b7 | 1519 | static int param_get_audit(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1520 | { |
b5e95b48 JJ |
1521 | if (!apparmor_enabled) |
1522 | return -EINVAL; | |
545de8fe JJ |
1523 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1524 | return -EPERM; | |
b5e95b48 JJ |
1525 | return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]); |
1526 | } | |
1527 | ||
e4dca7b7 | 1528 | static int param_set_audit(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
1529 | { |
1530 | int i; | |
b5e95b48 JJ |
1531 | |
1532 | if (!apparmor_enabled) | |
1533 | return -EINVAL; | |
b5e95b48 JJ |
1534 | if (!val) |
1535 | return -EINVAL; | |
545de8fe JJ |
1536 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
1537 | return -EPERM; | |
b5e95b48 | 1538 | |
5d8779a5 AS |
1539 | i = match_string(audit_mode_names, AUDIT_MAX_INDEX, val); |
1540 | if (i < 0) | |
1541 | return -EINVAL; | |
b5e95b48 | 1542 | |
5d8779a5 AS |
1543 | aa_g_audit = i; |
1544 | return 0; | |
b5e95b48 JJ |
1545 | } |
1546 | ||
e4dca7b7 | 1547 | static int param_get_mode(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 1548 | { |
b5e95b48 JJ |
1549 | if (!apparmor_enabled) |
1550 | return -EINVAL; | |
545de8fe JJ |
1551 | if (apparmor_initialized && !policy_view_capable(NULL)) |
1552 | return -EPERM; | |
b5e95b48 | 1553 | |
0d259f04 | 1554 | return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]); |
b5e95b48 JJ |
1555 | } |
1556 | ||
e4dca7b7 | 1557 | static int param_set_mode(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
1558 | { |
1559 | int i; | |
b5e95b48 JJ |
1560 | |
1561 | if (!apparmor_enabled) | |
1562 | return -EINVAL; | |
b5e95b48 JJ |
1563 | if (!val) |
1564 | return -EINVAL; | |
545de8fe JJ |
1565 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
1566 | return -EPERM; | |
b5e95b48 | 1567 | |
5d8779a5 AS |
1568 | i = match_string(aa_profile_mode_names, APPARMOR_MODE_NAMES_MAX_INDEX, |
1569 | val); | |
1570 | if (i < 0) | |
1571 | return -EINVAL; | |
b5e95b48 | 1572 | |
5d8779a5 AS |
1573 | aa_g_profile_mode = i; |
1574 | return 0; | |
b5e95b48 JJ |
1575 | } |
1576 | ||
341c1fda | 1577 | char *aa_get_buffer(bool in_atomic) |
df323337 SAS |
1578 | { |
1579 | union aa_buffer *aa_buf; | |
1580 | bool try_again = true; | |
341c1fda | 1581 | gfp_t flags = (GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN); |
df323337 SAS |
1582 | |
1583 | retry: | |
1584 | spin_lock(&aa_buffers_lock); | |
341c1fda JJ |
1585 | if (buffer_count > reserve_count || |
1586 | (in_atomic && !list_empty(&aa_global_buffers))) { | |
df323337 SAS |
1587 | aa_buf = list_first_entry(&aa_global_buffers, union aa_buffer, |
1588 | list); | |
1589 | list_del(&aa_buf->list); | |
341c1fda | 1590 | buffer_count--; |
df323337 SAS |
1591 | spin_unlock(&aa_buffers_lock); |
1592 | return &aa_buf->buffer[0]; | |
1593 | } | |
341c1fda JJ |
1594 | if (in_atomic) { |
1595 | /* | |
1596 | * out of reserve buffers and in atomic context so increase | |
1597 | * how many buffers to keep in reserve | |
1598 | */ | |
1599 | reserve_count++; | |
1600 | flags = GFP_ATOMIC; | |
1601 | } | |
df323337 SAS |
1602 | spin_unlock(&aa_buffers_lock); |
1603 | ||
341c1fda JJ |
1604 | if (!in_atomic) |
1605 | might_sleep(); | |
1606 | aa_buf = kmalloc(aa_g_path_max, flags); | |
df323337 SAS |
1607 | if (!aa_buf) { |
1608 | if (try_again) { | |
1609 | try_again = false; | |
1610 | goto retry; | |
1611 | } | |
1612 | pr_warn_once("AppArmor: Failed to allocate a memory buffer.\n"); | |
1613 | return NULL; | |
1614 | } | |
1615 | return &aa_buf->buffer[0]; | |
1616 | } | |
1617 | ||
1618 | void aa_put_buffer(char *buf) | |
1619 | { | |
1620 | union aa_buffer *aa_buf; | |
1621 | ||
1622 | if (!buf) | |
1623 | return; | |
1624 | aa_buf = container_of(buf, union aa_buffer, buffer[0]); | |
1625 | ||
1626 | spin_lock(&aa_buffers_lock); | |
1627 | list_add(&aa_buf->list, &aa_global_buffers); | |
341c1fda | 1628 | buffer_count++; |
df323337 SAS |
1629 | spin_unlock(&aa_buffers_lock); |
1630 | } | |
1631 | ||
b5e95b48 JJ |
1632 | /* |
1633 | * AppArmor init functions | |
1634 | */ | |
1635 | ||
1636 | /** | |
55a26ebf | 1637 | * set_init_ctx - set a task context and profile on the first task. |
b5e95b48 JJ |
1638 | * |
1639 | * TODO: allow setting an alternate profile than unconfined | |
1640 | */ | |
55a26ebf | 1641 | static int __init set_init_ctx(void) |
b5e95b48 | 1642 | { |
bf1d2ee7 | 1643 | struct cred *cred = (__force struct cred *)current->real_cred; |
b5e95b48 | 1644 | |
69b5a44a | 1645 | set_cred_label(cred, aa_get_label(ns_unconfined(root_ns))); |
b5e95b48 JJ |
1646 | |
1647 | return 0; | |
1648 | } | |
1649 | ||
d4669f0b JJ |
1650 | static void destroy_buffers(void) |
1651 | { | |
df323337 | 1652 | union aa_buffer *aa_buf; |
d4669f0b | 1653 | |
df323337 SAS |
1654 | spin_lock(&aa_buffers_lock); |
1655 | while (!list_empty(&aa_global_buffers)) { | |
1656 | aa_buf = list_first_entry(&aa_global_buffers, union aa_buffer, | |
1657 | list); | |
1658 | list_del(&aa_buf->list); | |
1659 | spin_unlock(&aa_buffers_lock); | |
1660 | kfree(aa_buf); | |
1661 | spin_lock(&aa_buffers_lock); | |
d4669f0b | 1662 | } |
df323337 | 1663 | spin_unlock(&aa_buffers_lock); |
d4669f0b JJ |
1664 | } |
1665 | ||
1666 | static int __init alloc_buffers(void) | |
1667 | { | |
df323337 SAS |
1668 | union aa_buffer *aa_buf; |
1669 | int i, num; | |
1670 | ||
1671 | /* | |
1672 | * A function may require two buffers at once. Usually the buffers are | |
1673 | * used for a short period of time and are shared. On UP kernel buffers | |
1674 | * two should be enough, with more CPUs it is possible that more | |
1675 | * buffers will be used simultaneously. The preallocated pool may grow. | |
1676 | * This preallocation has also the side-effect that AppArmor will be | |
1677 | * disabled early at boot if aa_g_path_max is extremly high. | |
1678 | */ | |
1679 | if (num_online_cpus() > 1) | |
341c1fda | 1680 | num = 4 + RESERVE_COUNT; |
df323337 | 1681 | else |
341c1fda | 1682 | num = 2 + RESERVE_COUNT; |
df323337 SAS |
1683 | |
1684 | for (i = 0; i < num; i++) { | |
1685 | ||
1686 | aa_buf = kmalloc(aa_g_path_max, GFP_KERNEL | | |
1687 | __GFP_RETRY_MAYFAIL | __GFP_NOWARN); | |
1688 | if (!aa_buf) { | |
1689 | destroy_buffers(); | |
1690 | return -ENOMEM; | |
d4669f0b | 1691 | } |
df323337 | 1692 | aa_put_buffer(&aa_buf->buffer[0]); |
d4669f0b | 1693 | } |
d4669f0b JJ |
1694 | return 0; |
1695 | } | |
1696 | ||
e3ea1ca5 TH |
1697 | #ifdef CONFIG_SYSCTL |
1698 | static int apparmor_dointvec(struct ctl_table *table, int write, | |
32927393 | 1699 | void *buffer, size_t *lenp, loff_t *ppos) |
e3ea1ca5 TH |
1700 | { |
1701 | if (!policy_admin_capable(NULL)) | |
1702 | return -EPERM; | |
1703 | if (!apparmor_enabled) | |
1704 | return -EINVAL; | |
1705 | ||
1706 | return proc_dointvec(table, write, buffer, lenp, ppos); | |
1707 | } | |
1708 | ||
1709 | static struct ctl_path apparmor_sysctl_path[] = { | |
1710 | { .procname = "kernel", }, | |
1711 | { } | |
1712 | }; | |
1713 | ||
1714 | static struct ctl_table apparmor_sysctl_table[] = { | |
1715 | { | |
1716 | .procname = "unprivileged_userns_apparmor_policy", | |
1717 | .data = &unprivileged_userns_apparmor_policy, | |
1718 | .maxlen = sizeof(int), | |
1719 | .mode = 0600, | |
1720 | .proc_handler = apparmor_dointvec, | |
1721 | }, | |
1722 | { } | |
1723 | }; | |
1724 | ||
1725 | static int __init apparmor_init_sysctl(void) | |
1726 | { | |
1727 | return register_sysctl_paths(apparmor_sysctl_path, | |
1728 | apparmor_sysctl_table) ? 0 : -ENOMEM; | |
1729 | } | |
1730 | #else | |
1731 | static inline int apparmor_init_sysctl(void) | |
1732 | { | |
1733 | return 0; | |
1734 | } | |
1735 | #endif /* CONFIG_SYSCTL */ | |
1736 | ||
e1af4779 | 1737 | #if defined(CONFIG_NETFILTER) && defined(CONFIG_NETWORK_SECMARK) |
ab9f2115 MG |
1738 | static unsigned int apparmor_ip_postroute(void *priv, |
1739 | struct sk_buff *skb, | |
1740 | const struct nf_hook_state *state) | |
1741 | { | |
1742 | struct aa_sk_ctx *ctx; | |
1743 | struct sock *sk; | |
1744 | ||
1745 | if (!skb->secmark) | |
1746 | return NF_ACCEPT; | |
1747 | ||
1748 | sk = skb_to_full_sk(skb); | |
1749 | if (sk == NULL) | |
1750 | return NF_ACCEPT; | |
1751 | ||
1752 | ctx = SK_CTX(sk); | |
1753 | if (!apparmor_secmark_check(ctx->label, OP_SENDMSG, AA_MAY_SEND, | |
1754 | skb->secmark, sk)) | |
1755 | return NF_ACCEPT; | |
1756 | ||
1757 | return NF_DROP_ERR(-ECONNREFUSED); | |
1758 | ||
1759 | } | |
1760 | ||
1761 | static unsigned int apparmor_ipv4_postroute(void *priv, | |
1762 | struct sk_buff *skb, | |
1763 | const struct nf_hook_state *state) | |
1764 | { | |
1765 | return apparmor_ip_postroute(priv, skb, state); | |
1766 | } | |
1767 | ||
a1a02062 | 1768 | #if IS_ENABLED(CONFIG_IPV6) |
ab9f2115 MG |
1769 | static unsigned int apparmor_ipv6_postroute(void *priv, |
1770 | struct sk_buff *skb, | |
1771 | const struct nf_hook_state *state) | |
1772 | { | |
1773 | return apparmor_ip_postroute(priv, skb, state); | |
1774 | } | |
a1a02062 | 1775 | #endif |
ab9f2115 MG |
1776 | |
1777 | static const struct nf_hook_ops apparmor_nf_ops[] = { | |
1778 | { | |
1779 | .hook = apparmor_ipv4_postroute, | |
1780 | .pf = NFPROTO_IPV4, | |
1781 | .hooknum = NF_INET_POST_ROUTING, | |
1782 | .priority = NF_IP_PRI_SELINUX_FIRST, | |
1783 | }, | |
1784 | #if IS_ENABLED(CONFIG_IPV6) | |
1785 | { | |
1786 | .hook = apparmor_ipv6_postroute, | |
1787 | .pf = NFPROTO_IPV6, | |
1788 | .hooknum = NF_INET_POST_ROUTING, | |
1789 | .priority = NF_IP6_PRI_SELINUX_FIRST, | |
1790 | }, | |
1791 | #endif | |
1792 | }; | |
1793 | ||
1794 | static int __net_init apparmor_nf_register(struct net *net) | |
1795 | { | |
1796 | int ret; | |
1797 | ||
1798 | ret = nf_register_net_hooks(net, apparmor_nf_ops, | |
1799 | ARRAY_SIZE(apparmor_nf_ops)); | |
1800 | return ret; | |
1801 | } | |
1802 | ||
1803 | static void __net_exit apparmor_nf_unregister(struct net *net) | |
1804 | { | |
1805 | nf_unregister_net_hooks(net, apparmor_nf_ops, | |
1806 | ARRAY_SIZE(apparmor_nf_ops)); | |
1807 | } | |
1808 | ||
1809 | static struct pernet_operations apparmor_net_ops = { | |
1810 | .init = apparmor_nf_register, | |
1811 | .exit = apparmor_nf_unregister, | |
1812 | }; | |
1813 | ||
1814 | static int __init apparmor_nf_ip_init(void) | |
1815 | { | |
1816 | int err; | |
1817 | ||
1818 | if (!apparmor_enabled) | |
1819 | return 0; | |
1820 | ||
1821 | err = register_pernet_subsys(&apparmor_net_ops); | |
1822 | if (err) | |
1823 | panic("Apparmor: register_pernet_subsys: error %d\n", err); | |
1824 | ||
1825 | return 0; | |
1826 | } | |
1827 | __initcall(apparmor_nf_ip_init); | |
e1af4779 | 1828 | #endif |
ab9f2115 | 1829 | |
b5e95b48 JJ |
1830 | static int __init apparmor_init(void) |
1831 | { | |
1832 | int error; | |
1833 | ||
a4c3f89c JJ |
1834 | aa_secids_init(); |
1835 | ||
11c236b8 JJ |
1836 | error = aa_setup_dfa_engine(); |
1837 | if (error) { | |
1838 | AA_ERROR("Unable to setup dfa engine\n"); | |
1839 | goto alloc_out; | |
1840 | } | |
1841 | ||
b5e95b48 JJ |
1842 | error = aa_alloc_root_ns(); |
1843 | if (error) { | |
1844 | AA_ERROR("Unable to allocate default profile namespace\n"); | |
1845 | goto alloc_out; | |
1846 | } | |
1847 | ||
e3ea1ca5 TH |
1848 | error = apparmor_init_sysctl(); |
1849 | if (error) { | |
1850 | AA_ERROR("Unable to register sysctls\n"); | |
1851 | goto alloc_out; | |
1852 | ||
1853 | } | |
1854 | ||
d4669f0b JJ |
1855 | error = alloc_buffers(); |
1856 | if (error) { | |
1857 | AA_ERROR("Unable to allocate work buffers\n"); | |
df323337 | 1858 | goto alloc_out; |
d4669f0b JJ |
1859 | } |
1860 | ||
55a26ebf | 1861 | error = set_init_ctx(); |
b5e95b48 JJ |
1862 | if (error) { |
1863 | AA_ERROR("Failed to set context on init task\n"); | |
b1d9e6b0 | 1864 | aa_free_root_ns(); |
d4669f0b | 1865 | goto buffers_out; |
b5e95b48 | 1866 | } |
d69dece5 CS |
1867 | security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks), |
1868 | "apparmor"); | |
b5e95b48 JJ |
1869 | |
1870 | /* Report that AppArmor successfully initialized */ | |
1871 | apparmor_initialized = 1; | |
1872 | if (aa_g_profile_mode == APPARMOR_COMPLAIN) | |
1873 | aa_info_message("AppArmor initialized: complain mode enabled"); | |
1874 | else if (aa_g_profile_mode == APPARMOR_KILL) | |
1875 | aa_info_message("AppArmor initialized: kill mode enabled"); | |
1876 | else | |
1877 | aa_info_message("AppArmor initialized"); | |
1878 | ||
1879 | return error; | |
1880 | ||
d4669f0b JJ |
1881 | buffers_out: |
1882 | destroy_buffers(); | |
b5e95b48 JJ |
1883 | alloc_out: |
1884 | aa_destroy_aafs(); | |
11c236b8 | 1885 | aa_teardown_dfa_engine(); |
b5e95b48 | 1886 | |
954317fe | 1887 | apparmor_enabled = false; |
b5e95b48 | 1888 | return error; |
b5e95b48 JJ |
1889 | } |
1890 | ||
3d6e5f6d | 1891 | DEFINE_LSM(apparmor) = { |
07aed2f2 | 1892 | .name = "apparmor", |
14bd99c8 | 1893 | .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE, |
c5459b82 | 1894 | .enabled = &apparmor_enabled, |
bbd3662a | 1895 | .blobs = &apparmor_blob_sizes, |
3d6e5f6d KC |
1896 | .init = apparmor_init, |
1897 | }; |